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煤矿井下水力压裂自动控制系统设计 被引量:1
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作者 刘波 《工矿自动化》 CSCD 北大核心 2024年第3期6-13,共8页
分析指出目前煤矿井下水力压裂技术面临压裂泵输出压力和流量无法快速精确调节、远程安全监控效果及自动化水平有待提高等难题。设计了一种煤矿井下水力压裂自动控制系统。根据煤矿井下水力压裂工艺及系统构成,明确了控制系统关键技术... 分析指出目前煤矿井下水力压裂技术面临压裂泵输出压力和流量无法快速精确调节、远程安全监控效果及自动化水平有待提高等难题。设计了一种煤矿井下水力压裂自动控制系统。根据煤矿井下水力压裂工艺及系统构成,明确了控制系统关键技术为高压大流量压裂泵输出流量和压力的快速精确调节,远程高可靠性安全、高速实时监控,一键启停及图形化分析等。以KXH12本安型控制器为核心,搭配变频器、组合开关、监控主机、电动开度球阀等设备,以及光纤加CAN总线的双线冗余通信方案,研发了控制系统硬件,并编制了压裂泵控制器、水箱控制器及中央控制器软件,实现了压裂系统快速变流量注水、稳定保压及远程高速实时监控和报警等功能。在煤矿现场对水力压裂自动控制系统进行工业性试验,结果表明该系统压力控制精度为0.1 MPa,流量控制精度为0.1 m3/h,在连续完成14次压裂过程中,每次煤岩层开裂后均能实现较好的保压效果,且操作简单,安全性高,满足煤矿井下水力压裂工艺要求。 展开更多
关键词 矿井水力 流量控制 压力控制 远程自动控制 变频电力驱动
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煤层气井压裂施工压力与裂缝形态简析 被引量:32
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作者 郝艳丽 王河清 李玉魁 《煤田地质与勘探》 CAS CSCD 北大核心 2001年第3期20-22,共3页
根据煤层气试验井的施工资料 ,分析了煤层压裂施工压力的特点以及井深、Ro与破压梯度的关系 ,并根据裂缝监测 (测井温法、大地电位法和微地震法 )测量的裂缝方位和缝高 ,对煤层压裂形成的裂缝特点进行了分类和总结 。
关键词 煤层气 施工压力 井深 梯度
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水平井射孔参数对压裂起裂压力的影响分析
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作者 徐波 《国外测井技术》 2021年第2期104-106,共3页
对于压裂施工而言,水平井压裂起裂压力具有至关重要的作用。而水平井射孔参数是对压裂起裂压力具有较大影响的因子。因此,文章以水平井参数为自变量,以压裂起裂压力为因变量,阐述了水平井射孔参数对压裂起裂压力的影响,并结合数据,对实... 对于压裂施工而言,水平井压裂起裂压力具有至关重要的作用。而水平井射孔参数是对压裂起裂压力具有较大影响的因子。因此,文章以水平井参数为自变量,以压裂起裂压力为因变量,阐述了水平井射孔参数对压裂起裂压力的影响,并结合数据,对实验结果进行了分析,希望为水平井射孔技术的有效应用提供一些参考。 展开更多
关键词 水平井 螺旋射孔参数 压力
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高能气体压裂的适用范围及选井选层 被引量:4
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作者 刘发喜 《西安石油学院学报》 1992年第2期7-12,共6页
本文在分析高能气体压裂增产机理的基础上,探讨了该技术在油田勘探与开发过程中的应用范围及其试验时的选井选层的原则。
关键词 高能气体 压力压裂 水力
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在小型压裂压力下降过程中是什么引起压力急剧变化?
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作者 津强 《中外科技情报》 2003年第6期82-95,共14页
关键词 压力 三次采油 漏失系数 闭合应力 小型试验
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薄层压裂中的近井筒效应及对策
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作者 崔彦立 殷静 《吐哈油气》 2004年第2期123-129,共7页
随着油田开发对象转向二类、三类储层以及细分层系调整、井网加密调整的实施,平面上薄注厚采、薄采厚注现象更为普遍,薄层改造是层间、层内挖潜、增储稳产的重要课题。详细介绍了薄层压裂中的砂堵分析、近井筒效应的机理,讨论了解决的对... 随着油田开发对象转向二类、三类储层以及细分层系调整、井网加密调整的实施,平面上薄注厚采、薄采厚注现象更为普遍,薄层改造是层间、层内挖潜、增储稳产的重要课题。详细介绍了薄层压裂中的砂堵分析、近井筒效应的机理,讨论了解决的对策,并在生产实际中得到验证。 展开更多
关键词 薄层作业 近井筒效应 油田开发 支撑剂 井底压力 压力
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物理—数据双驱动的压裂压力实时预测方法
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作者 胡晓东 刘俊仪 +4 位作者 王天宇 周福建 卢旭涛 易普康 陈超 《石油实验地质》 CAS 2024年第6期1323-1335,共13页
井口压力预测存在压力波动剧烈、干扰因素多以及影响机理复杂等问题。现阶段研究中,由于对复杂的地层条件、裂缝特征及流体动力学过程的过度简化,传统物理模型难以捕捉多重非线性变化和突发波动,导致在真实施工环境下的预测精度和实时... 井口压力预测存在压力波动剧烈、干扰因素多以及影响机理复杂等问题。现阶段研究中,由于对复杂的地层条件、裂缝特征及流体动力学过程的过度简化,传统物理模型难以捕捉多重非线性变化和突发波动,导致在真实施工环境下的预测精度和实时响应能力受到局限。而人工智能模型尽管具有较强的非线性拟合能力,但往往缺乏对压力波动的物理机理的深入理解,对地层和施工参数的敏感性不足,导致在极端或动态变化的条件下稳定性较差、解释性不足。针对这一难题,提出了一种物理—数据双驱动的压力曲线的预测方法对未来压力趋势进行预测。首先,构建了基于长短期记忆(LSTM)神经网络的智能模型,融合缝内支撑剂床平衡高度计算结果与井场实时泵注数据作为模型输入,预测了未来60 s的压力数据;其次,结合传统井口压力反演方法,使用小波变换分解智能模型与传统模型预测结果,利用LSTM模型整体趋势与压力反演计算方法(IPC)模型中突变点特征,重构了兼顾整体趋势和局部波动的井口压力预测曲线。结果表明,相比LSTM模型,IPC和LSTM的小波融合模型未来60 s井口压力预测的均方根误差(RMSE)和均方绝对误差(MAE)分别下降了37.87%和15.29%,预测结果能够精准捕捉现场施工的压裂压力变化,为现场施工提供更为可靠的指导和决策依据。 展开更多
关键词 压力预测 物理—数据双驱 LSTM IPC 小波变换 融合模型
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温-压作用下水泥环缺陷对套管应力的影响 被引量:14
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作者 郭雪利 李军 +1 位作者 柳贡慧 范明涛 《石油机械》 北大核心 2018年第4期112-118,共7页
在页岩气水平井多级分段压裂施工中,由于压裂段固井质量较差,当井筒温度和压力急剧变化时,套管失效风险会大大增加。在现场完井和压裂施工数据基础之上,综合考虑压裂压力和井底温度变化,建立了不同水泥环形态的套管-水泥-地层组合体模型... 在页岩气水平井多级分段压裂施工中,由于压裂段固井质量较差,当井筒温度和压力急剧变化时,套管失效风险会大大增加。在现场完井和压裂施工数据基础之上,综合考虑压裂压力和井底温度变化,建立了不同水泥环形态的套管-水泥-地层组合体模型,研究压裂过程中水泥环缺失、压裂压力和温度变化对套管应力的影响。计算结果表明:压裂施工中,当以大排量向井筒内泵入压裂液时,井底温度显著降低;如果施工压力较大、水泥环出现窜槽缺失,则套管会产生应力集中,这将急剧增加套管应力,大大增加套管失效风险。固井质量对井筒完整性至关重要,同时必须将压裂液温度、排量和施工压力控制在合理范围,从而保证压裂过程中套管的安全。 展开更多
关键词 固井质量 套管应力 水泥环缺失 压力 页岩气井 套管失效
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一种计算裂缝砂卡位置的新方法 被引量:1
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作者 王正茂 李治平 +3 位作者 李允 王嘉淮 赵志辉 彭少涛 《西南石油学院学报》 CSCD 2004年第1期51-53,共3页
在压裂施工作业过程中有可能在裂缝中形成砂卡 ,砂卡一旦形成必然会影响到压裂施工压力 ,为了准确计算裂缝中砂卡的位置 ,可以对压裂施工压力进行分析。通过做出压裂施工压力和施工时间的双对数曲线 ,可以确定砂卡发生后的压力响应数据 ... 在压裂施工作业过程中有可能在裂缝中形成砂卡 ,砂卡一旦形成必然会影响到压裂施工压力 ,为了准确计算裂缝中砂卡的位置 ,可以对压裂施工压力进行分析。通过做出压裂施工压力和施工时间的双对数曲线 ,可以确定砂卡发生后的压力响应数据 ,将这些数据进行线性回归 ,求得直线段斜率 ,然后根据求得的斜率和相关的裂缝参数 ,即可求出裂缝中砂卡的位置。这对于正确指导压裂施工作业以及获得优质裂缝具有重要意义。 展开更多
关键词 施工压力 砂卡 双对数曲线
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专利名称:压裂瞬间油管内外压力记录仪
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《测井技术信息》 2002年第4期52-53,共2页
关键词 大庆市天镇有限公司 压力传感器 电路板 实测 闭合压力 施工时间 综合滤失系数 专利 瞬间油管内外压力记录仪
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Influence of Perforation on Formation Fracturing Pressure 被引量:7
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作者 张广清 陈勉 +1 位作者 王学双 赵冲 《Petroleum Science》 SCIE CAS CSCD 2004年第3期56-61,共6页
Hydraulic fracturing treatments of oil wells are greatly affected by the perforation parameters selected. The three-dimensional finite element model together with the tensile criterion of rock materials is employed t... Hydraulic fracturing treatments of oil wells are greatly affected by the perforation parameters selected. The three-dimensional finite element model together with the tensile criterion of rock materials is employed to systematically investigate the influence of perforation parameters, such as perforation density, perforation orientation, perforation diameter, and perforation length as well as wellbore ellipticity, in vertical wells on the formation fracturing pressure. Based on a six-month simulation research in the University of Petroleum, China, several conclusions are drawn for the first time. Perforation density and perforation orientation angle are the most important parameters controlling the formation fracturing pressure. As the perforation density increases, the fracturing pressure decreases, not linearly but progressively. The fracturing pressure increases with the perforation orientation angle only when the angle is less than 45 degrees, and the relationship becomes very flat when the angle is 45 degrees. However, with regards to the perforation diameter and perforation length, their influences are much slighter. The wellbore ellipticity has a significant effect on the formation fracturing pressure. It is obvious that fracturing pressure increases linearly with the ellipticity of the wellbore. 展开更多
关键词 Fracturing pressure three-dimensional finite element perforation parameter
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火山岩地层压后分析——显示产生多裂缝系统
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作者 徐涛 赵东 +1 位作者 程凤莲 孙贺东 《国外油田工程》 2006年第6期22-26,共5页
水力压裂工艺技术正面临着从传统的单一平面裂缝向产生弯曲裂缝网络和多条水力裂缝同时发育的概念性转变。这一新概念被用来分析火山岩地层中进行的两次加支撑剂的压裂处理。两次压裂虽然产能都增加了一倍,但是压裂是不成功的。压裂施... 水力压裂工艺技术正面临着从传统的单一平面裂缝向产生弯曲裂缝网络和多条水力裂缝同时发育的概念性转变。这一新概念被用来分析火山岩地层中进行的两次加支撑剂的压裂处理。两次压裂虽然产能都增加了一倍,但是压裂是不成功的。压裂施工净压力很高,并且施工中出现了早期脱砂现象。传统的单一平面裂缝概念无法解释压裂压力动态或压后产能和压力动态,应用多裂缝几何形态可以很好地解释这一问题,并且能够成功地模拟压裂压力。这种裂缝几何形态与压裂施工中出现的早期脱砂现象以及压后生产动态完全一致。压裂压力和随后的生产动态综合分析证实在火山岩地层中产生了多条裂缝。 展开更多
关键词 火山岩地层 压力动态 后产能 缝系统
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Numerical simulation of hydraulic fracture propagation in weakly consolidated sandstone reservoirs 被引量:7
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作者 LIN Hai DENG Jin-gen +3 位作者 LIU Wei XIE Tao XU Jie LIU Hai-long 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第12期2944-2952,共9页
Frac-packing technology has been introduced to improve the development effect of weakly consolidated sandstone.It has double effects on increasing production and sand control.However,determining operation parameters o... Frac-packing technology has been introduced to improve the development effect of weakly consolidated sandstone.It has double effects on increasing production and sand control.However,determining operation parameters of frac-packing is the key factor due to the particularity of weakly consolidated sandstone.In order to study the mechanisms of hydraulic fracture propagation and reveal the effect of fracturing parameters on fracture morphology in weakly consolidated sandstone,finite element numerical model of fluid-solid coupling is established to carry out numerical simulation to analyze influences of mechanical characteristics,formation permeability,fracturing fluid injection rate and viscosity on fracture propagation.The result shows that lower elastic modulus is favorable for inducing short and wide fractures and controls the fracture length while Poisson ratio has almost no effect.Large injection rate and high viscosity of fracturing fluid are advantageous to fracture initiation and propagation.Suitable fractures are produced when the injection rate is approximate to3–4m3/min and fluid viscosity is over100mPa?s.The leak-off of fracturing fluid to formation is rising with the increase of formation permeability,which is adverse to fracture propagation.The work provides theoretical reference to determine the construction parameters for the frac-packing design in weakly consolidated reservoirs. 展开更多
关键词 weakly-consolidated sandstone frac-packing hydraulic fracture fracture propagation numerical simulation
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Reservoir reconstruction technologies for coalbed methane recovery in deep and multiple seams 被引量:11
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作者 Wang Liang Liu Shimin +3 位作者 Cheng Yuanping Yin Guangzhi Zhang Dongming Guo Pinkun 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2017年第2期277-284,共8页
Multiple coal seams widely develop in the deep Chinese coal-bearing strata. Ground in situ stress and coal seam gas pressure increase continuously with the increase of the mining depth, and coal and gas outburst disas... Multiple coal seams widely develop in the deep Chinese coal-bearing strata. Ground in situ stress and coal seam gas pressure increase continuously with the increase of the mining depth, and coal and gas outburst disasters become increasingly severe. When the coal is very deep, the gas content and pressure will elevate and thus coal seams tends to outburst-prone seams. The safety and economics of exploited firstmined coal seams are tremendously restricted. Meanwhile, the multiple seams occurrence conditions resulted in different methane pressure systems in the coal-bearing strata, which made the reservoir reconstruction of coal difficult. Given the characteristics of low saturation, low permeability, strong anisotropy and soft coal of Chinese coal seams, a single hydraulic fracturing surface well for reservoir reconstruction to pre-drain the coalbed methane(CBM) of multiple seams concurrently under the different gas pressure systems has not yet gained any breakthroughs. Based on analyses of the main features of deep CBM reservoirs in China, current gas control methods and the existing challenges in deep and multiple seams, we proposed a new technology for deep CBM reservoir reconstruction to realize simultaneous high-efficiency coal mining and gas extraction. In particular, we determined the first-mined seam according to the principles of effectiveness and economics, and used hydraulic fracturing surface well to reconstruct the first-mined seam which enlarges the selection range of the first-mined seam. During the process of mining first-mined seam, adjacent coal seams could be reconstructed under the mining effect which promoted high-efficiency pressure relief gas extraction by using spatial and comprehensive gas drainage methods(combination of underground and ground CBM extraction methods). A typical integrated reservoir reconstruction technology, ‘‘One well for triple use", was detailed introduced and successfully applied in the Luling coal mine. The application showed that the proposed technology could effectively promote coal mining safety and simultaneously high-efficiency gas extraction. 展开更多
关键词 Reservoir reconstruction Coalbed methane Multiple seam Surface well Gas drainage
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Characterization of Hydraulic Fracture with Inflated Dislocation Moving Within a Semi-infinite Medium 被引量:6
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作者 OUYANG Zhi-hua ELSWORTH Derek LI Qiang 《Journal of China University of Mining and Technology》 EI 2007年第2期220-225,共6页
Hydraulic fracturing is accompanied by a change in pore fluid pressure. As a result,this may be conveniently represented as inflated dislocation moving within a semi-infinite medium. Theory is developed to describe th... Hydraulic fracturing is accompanied by a change in pore fluid pressure. As a result,this may be conveniently represented as inflated dislocation moving within a semi-infinite medium. Theory is developed to describe the pore pressures that build up around an inflated volumetric dislocation migrating within a saturated porous-elastic semi-infinite medium as analog to hydraulic fracturing emplacement. The solution is capable of evaluating the system behavior of both constant fluid pressure and zero flux surface conditions through application of a superposition. Characterization of horizontal moving dislocation processes is conducted as an application of these techniques. Where the mechanical and hydraulic parameters are defined,a priori,type curve matching of responses may be used to evaluate emplacement location uniquely. Pore pressure response elicited at a dilation,subject to pressure control is of interest in representing hydraulic fracturing where leak-off is an important component. The effect of hydraulic fracturing on fracture fluid pressure is evaluated in a poroelastic hydraulic fracture model utilizing dislocation theory. A minimum set of dimensionless parameters are defined that describe the system. Pore fluid pressures recorded during hydraulic fracturing of a well in the San Joaquin Valley of Central California is examined using the proposed model. The estimated geometry of the hydraulic fracture is matched with reasonable fidelity with the measured data. 展开更多
关键词 volumetric dislocation: hydraulic fracturing dimensionless analysis pore pressure
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Sheet metal hardening curve determined by laminated sample and its adaptability to sheet forming processes 被引量:1
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作者 田浩彬 林建平 +1 位作者 康达昌 刘瑞同 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2007年第6期752-755,共4页
The hardening curve for sheet metal can be determined from the load-displacement curve of tensile specimen with rectangular cross-section. Therefore,uniaxial compression test on cylinder specimen made from laminated s... The hardening curve for sheet metal can be determined from the load-displacement curve of tensile specimen with rectangular cross-section. Therefore,uniaxial compression test on cylinder specimen made from laminated sample is put forward. Considering the influence of anisotropy on hardening properties and the stress state in popular forming process,plane strain compression test on cubic specimen made from laminated sample was advanced. Results show that the deformation range of hardening curves obtained from the presented methods is wide,which meets the need for the application in sheet metal forming processes. In view of the characteristics of methods presented in the paper and the stress strain state of various forming processes,the adaptability of the two methods presented in this paper is given. 展开更多
关键词 hardening curve laminated sheet sample uniaxial compression test plane strain compression test
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Pressure transient analysis of a finite-conductivity multiple fractured horizontal well in linear composite gas reservoirs 被引量:1
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作者 REN Jun-jie GAO Yang-yang +2 位作者 ZHENG Qiao GUO Ping WANG De-long 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第3期780-796,共17页
Faulted gas reservoirs are very common in reality,where some linear leaky faults divide the gas reservoir into several reservoir regions with distinct physical properties.This kind of gas reservoirs is also known as l... Faulted gas reservoirs are very common in reality,where some linear leaky faults divide the gas reservoir into several reservoir regions with distinct physical properties.This kind of gas reservoirs is also known as linear composite(LC)gas reservoirs.Although some analytical/semi-analytical models have been proposed to investigate pressure behaviors of producing wells in LC reservoirs based on the linear composite ideas,almost all of them focus on vertical wells and studies on multiple fractured horizontal wells are rare.After the pressure wave arrives at the leaky fault,pressure behaviors of multiple fractured horizontal wells will be affected by the leaky faults.Understanding the effect of leaky faults on pressure behaviors of multiple fractured horizontal wells is critical to the development design.Therefore,a semi-analytical model of finite-conductivity multiple fractured horizontal(FCMFH)wells in LC gas reservoirs is established based on Laplace-space superposition principle and fracture discrete method.The proposed model is validated against commercial numerical simulator.Type curves are obtained to study pressure characteristics and identify flow regimes.The effects of some parameters on type curves are discussed.The proposed model will have a profound effect on developing analytical/semi-analytical models for other complex well types in LC gas reservoirs. 展开更多
关键词 semi-analytical model linear composite gas reservoir multiple fractured horizontal well finite-conductivity hydraulic fracture pressure behavior
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Numerical modeling of time-dependent closure of coal seam artificial fractures
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作者 Ting-Kan LU Fang-Tao CHANG +1 位作者 Zhao-Feng WANG Peng-Ju YUAN 《Journal of Coal Science & Engineering(China)》 2013年第4期441-453,共13页
In order to improve efficiency of coal seam gas drainage, many fracturing techniques, such as waterjet fracturing, hydraulic fracturing and explosive fracturing, etc, have been developed and widely used in China coal ... In order to improve efficiency of coal seam gas drainage, many fracturing techniques, such as waterjet fracturing, hydraulic fracturing and explosive fracturing, etc, have been developed and widely used in China coal mining industry. How- ever, during the engineering applications, it is observed that the efficiency of gas drainage initially improves, but reduces there- after. Thus, it is speculated that the contrasts in coalbed methane drainage efficiency may reflect variation of the closure be- havior of the artificial fracture created. Based on comprehensive gas drainage monitoring data in underground coal mines, the work presented herein uses numerical simulation to show the behavior of the time-dependent closure of coal seam fractures as- sociated with various levels of waterjet fracturing parameters and geomechanical conditions. 展开更多
关键词 CLOSURE artificial fracture modeling TIME-DEPENDENT
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Theory and application of rock burst prevention using deep hole high pressure hydraulic fracturing 被引量:3
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作者 Shan-Kun ZHAO Jun LIU +3 位作者 Xiang-Zhi WEI Chuan-Hong DING Yu-Lei LV Gang-Feng LI 《Journal of Coal Science & Engineering(China)》 2013年第2期136-142,共7页
In order to analyze the mechanism of deep hole high pressure hydraulic fracturing, nonlinear dynamic theory, damage mechanics, elastic-plastic mechanics are used, and the law of crack propagation and stress transfer u... In order to analyze the mechanism of deep hole high pressure hydraulic fracturing, nonlinear dynamic theory, damage mechanics, elastic-plastic mechanics are used, and the law of crack propagation and stress transfer under two deep hole hydraulic fracturing in tectonic stress areas is studied using seepage-stress coupling models with RFPA simulation software. In addition, the effects of rock burst control are tested using multiple methods, either in the stress field or in the energy field. The research findings show that with two deep holes hydraulic fracturing in tectonic stress areas, the direction of the main crack propagation under shear-tensile stress is parallel to the greatest principal stress direction. High-pressure hydraulic fracturing water seepage can result in the destruction of the coal structure, while also weakening the physical and mechanical properties of coal and rock. Therefore the impact of high stress concentration in hazardous areas will level off, which has an effect on rock burst prevention and control in the region. 展开更多
关键词 rock burst deep hole high pressure hydraulic fracturing seepage-stress coupling models stress concentration factor
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Pulsating hydraulic fracturing technology in low permeability coal seams 被引量:10
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作者 Wang Wenchao Li Xianzhong +1 位作者 Lin Baiquan Zhai Cheng 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第4期681-685,共5页
Based on the difficult situation of gas drainage in a single coal bed of high gas content and low perme- ability, we investigate the technology of pulsating hydraulic pressure relief, the process of crank plunger move... Based on the difficult situation of gas drainage in a single coal bed of high gas content and low perme- ability, we investigate the technology of pulsating hydraulic pressure relief, the process of crank plunger movement and the mechanism of pulsating pressure formation using theoretical research, mathematical modeling and field testing. We analyze the effect of pulsating pressure on the formation and growth of fractures in coal by using the pulsating hydraulic theory in hydraulics. The research results show that the amplitude of fluctuating pressure tends to increase in the case where the exit is blocked, caused by pulsating pressure reflection and frictional resistance superposition, and it contributes to the growth of fractures in coal. The crack initiation pressure of pulsating hydraulic fracturing is 8 MPa, which is half than that of normal hydraulic fracturing; the pulsating hydraulic fracturing influence radius reaches 8 m. The total amount of gas extraction is increased by 3.6 times, and reaches 50 LJmin at the highest point. The extraction flow increases greatly, and is 4 times larger than that of drilling without fracturing and 1.2 times larger than that of normal hydraulic fracturing. The technology provides a technical measure for gas drainage of high gas content and low permeability in the single coal bed. 展开更多
关键词 Gas drainage Pulsating hydraulic fracturing Fatigue damage Permeability improvement
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