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基于ALE-FEM耦合算法的磨料水射流破岩数值模拟及其机理分析

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石油科学通报 2024年第4期9卷 627-636页

作者：徐鹏盛茂田守嶒王天宇中国石油大学(北京)油气资源与工程全国重点实验室北京102249

磨料水射流在钻井提速、深穿透射孔和压裂增产等方面应用效果显著,深入认识磨料水射流破岩机理是提升其应用效果的关键之一。本文基于任意拉格朗日—欧拉耦合有限单元算法,提出了独立封装有限元网格描述磨料的方法,将水射流单元设定网... 详细信息

磨料水射流在钻井提速、深穿透射孔和压裂增产等方面应用效果显著,深入认识磨料水射流破岩机理是提升其应用效果的关键之一。本文基于任意拉格朗日—欧拉耦合有限单元算法,提出了独立封装有限元网格描述磨料的方法,将水射流单元设定网格随物质的运动而变化以实现流体流动特性,速度设置给物质;将磨料单元设定网格不随物质的运动而变化以实现固体颗粒特性,速度设置给网格。综合考虑岩石的动态冲击损伤作用以及水射流和磨料的协作,建立了可表征水射流流动和岩石损伤破坏的多相多物理场耦合过程的磨料水射流破岩模型,模型聚焦磨料颗粒和水射流对岩石微秒级的冲击破坏。采用2套网格捕捉磨料和水射流的协同破岩作用,得到了岩石破碎体积、岩石损伤场、水射流压力场、水射流和磨料对岩石破碎的能量贡献率等关键参数的时空演化特征。结果表明,磨料水射流破岩过程磨料起主导作用,水射流起辅助作用。分析得到磨料水射流中磨料—水射流协同破岩机理认识,磨料撞击岩石使岩石局部产生的高程度损伤降低了水射流破岩的难度,此外磨料冲击破碎岩石使得水射流和岩石之间产生新界面,促使水射流的冲击压力升高,提高了水射流的破岩能力,因此磨料水射流中的水相比于纯水射流具有更高的射流打击力和能量利用率,磨料冲击预损伤岩石叠加水射流聚集增压的磨料—水射流协同作用破岩是磨料水射流破岩效率和能量利用率高于纯水射流数倍的重要机理之一。研究结果对优化磨料水射流破岩参数提供了理论模型和设计依据。

关键词：磨料水射流数值模拟 ALE-FEM 破岩机理

维普期刊数据库博看期刊评论

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储层温度对页岩微观力学性质的影响

钻采工艺 2024年第1期47卷 73-79页

作者：程世忠盛茂任乐佳王天宇田守嶒李根生油气资源与探测国家重点实验室北京市102249 中国石油大学(北京) 中国工程院

深部页岩气储层温度较高,为了研究地层温度对页岩宏微观力学性质的影响,采用四川盆地长宁区块寒武系龙马溪组井下页岩岩心,开展了26℃、80℃、150℃条件下的网格式微米压痕实验,分别模拟地表、中深层与深部储层的环境温度。采用去卷积... 详细信息

深部页岩气储层温度较高,为了研究地层温度对页岩宏微观力学性质的影响,采用四川盆地长宁区块寒武系龙马溪组井下页岩岩心,开展了26℃、80℃、150℃条件下的网格式微米压痕实验,分别模拟地表、中深层与深部储层的环境温度。采用去卷积数据统计分析方法量化了温度对页岩微观力学性质的影响,结合能量分析法研究了温度对页岩微观尺度断裂韧性的影响规律,并分析了温度对深部页岩裂缝导流能力影响的作用机制。结果表明,随着深部储层温度的增加,显著削弱了页岩的微观弹性模量、硬度与断裂韧性,而增加了压痕点弹性变形能力;弹性变形能力的增强导致矿物簇受应力作用后具有恢复弹性形变的能力,进一步说明水力裂缝扩展后缝周矿物弹性形变易恢复,压裂裂缝难维持。该研究结果对从岩石微观力学角度理解深部页岩气储层水力裂缝导流能力低提供了理论支持。

关键词：深部页岩气储层储层温度岩石力学微米压痕水力压裂裂缝

鄂尔多斯盆地页岩油储层前置CO_(2)压裂流体分布特征

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西安石油大学学报（自然科学版） 2024年第2期39卷 55-61页

作者：臧雨溪王海柱王斌孙居正王天宇田港华石明亮吴毓乾田守嶒中国石油大学(北京)油气资源与探测国家重点实验室中国北京102249 中国石油新疆油田分公司采气一厂新疆克拉玛依834000 中国石油大学(北京)克拉玛依校区石油学院新疆克拉玛依834000

以鄂尔多斯盆地页岩油储层为对象,基于油藏数值模拟软件CMG-GEM及GOHFER,研究了CO_(2)注入量、闷井时间、储层水平/垂直渗透率比值、双水平井射孔压裂方式对流体分布的影响。结果表明:水平和垂直方向渗透率的差异性导致CO_(2)在水平方... 详细信息

以鄂尔多斯盆地页岩油储层为对象,基于油藏数值模拟软件CMG-GEM及GOHFER,研究了CO_(2)注入量、闷井时间、储层水平/垂直渗透率比值、双水平井射孔压裂方式对流体分布的影响。结果表明:水平和垂直方向渗透率的差异性导致CO_(2)在水平方向波及范围较大,注入量对波及长度影响更为敏感,该研究条件下注入量为140 m^(3)时邻段水平波及范围出现交汇,可认定为最优注入量;延长闷井时间可增大CO_(2)波及范围,但注入量的影响程度更大,建议通过调节注入量来控制波及范围;水平/垂直渗透率比对CO_(2)波及范围影响较大,比值越大水平方向波及越广、垂向波及范围越窄,呈扁平状分布;对比双水平井拉链式与同步式射孔压裂,其中拉链式射孔压裂有助于提升CO_(2)波及范围,有利于油气开发。研究可为页岩油储层前置CO_(2)压裂工艺参数优化设计提供理论指导。

关键词：储层改造前置CO_(2)注入流体分布非常规油气页岩油储层

Numerical simulation of three-dimensional fracturing fracture propagation in radial wells

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Petroleum Exploration and Development 2023年第3期50卷 699-711页

作者： WANG tianyu GUO Zhaoquan LI Gensheng MA Zhengchao YONG Yuning CHANG Xin tian shouceng State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Beijing Petroleum Machinery Co. Ltd.China National Petroleum Corporation Engineering Technology Research InstituteBeijing 102206China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China

A fracture propagation model of radial well fracturing is established based on the finite element-meshless *** model considers the coupling effect of fracturing fluid flow and rock matrix *** fracture geometries of radial well fracturing are simulated,the induction effect of radial well on the fracture is quantitatively characterized,and the influences of azimuth,horizontal principle stress difference,and reservoir matrix permeability on the fracture geometries are *** radial wells can induce the fractures to extend parallel to their axes when two radial wells in the same layer are *** the radial wells are symmetrically distributed along the direction of the minimum horizontal principle stress with the azimuth greater than 15,the extrusion effect reduces the fracture length of radial *** the radial wells are symmetrically distributed along the direction of the maximum horizontal principal stress,the extrusion increases the fracture length of the radial *** fracture geometries are controlled by the rectification of radial borehole,the extrusion between radial wells in the same layer,and the deflection of the maximum horizontal principal *** the radial wells are distributed along the minimum horizontal principal stress symmetrically,the fracture length induced by the radial well decreases with the increase of azimuth;in contrast,when the radial wells are distributed along the maximum horizontal principal stress symmetrically,the fracture length induced by the radial well first decreases and then increases with the increase of *** fracture length induced by the radial well decreases with the increase of horizontal principal stress *** increase of rock matrix permeability and pore pressure of the matrix around radial wells makes the inducing effect of the radial well on fractures increase.

关键词： radial well three-dimensional fracturing fracture propagation simulation finite element-meshless method fluid-solid coupling

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新疆MH气藏改建储气库交变注采出砂机制

新疆石油天然气 2024年第2期20卷 56-62页

作者：田守嶒张文宏翁锦涛关子越王剑波刘敦卿中国石油大学(北京)克拉玛依校区新疆克拉玛依834000 中国石油大学(北京) 北京昌平102249 中国石油新疆油田分公司工程技术研究院新疆克拉玛依834000

新疆MH气藏经过多年衰竭式开采,为保障季节调峰需求,现将衰竭气藏改建储气库。受储气库交变注采的影响,注采气过程中储层易发生出砂,对储气库的运行及稳定具有一定的影响。针对储气库交变注采模式下的出砂机理,采用储层岩心开展物性、... 详细信息

新疆MH气藏经过多年衰竭式开采,为保障季节调峰需求,现将衰竭气藏改建储气库。受储气库交变注采的影响,注采气过程中储层易发生出砂,对储气库的运行及稳定具有一定的影响。针对储气库交变注采模式下的出砂机理,采用储层岩心开展物性、岩石力学与交变驱替实验,分析了岩心主要成分、胶结情况及力学性质,探究了生产压差、围压和交变注采过程对出砂的影响。实验研究结果表明,储层骨架间具有溶蚀绢化现象,黏土矿物中高岭石含量高,力学强度性质较弱,在储气库工况下有发生出砂的风险。在循环注采条件下,生产压差的增加促进了砂的产出,当生产压差超过6 MPa时,岩石处于临界出砂状态。围压的增加导致了出砂的提前,随着围压的升高,出砂量先增大后减少,孔隙通道的挤压是引发出砂量降低的主要因素。交变注采与常规采气相比,阶段出砂量呈现波浪式变化。多轮次交变注采引发的冲蚀过程和胶结疲劳破坏是加剧储气库出砂现象的主要因素。

关键词：储气库出砂机理交变注采出砂实验衰竭气藏

Research and application of water jet technology in well completion and stimulation in China

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Petroleum Science 2010年第2期7卷 239-244页

作者： Li Gensheng Huang Zhongwei tian shouceng Shen Zhonghou State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China

In recent years, rapid progress in the use of high pressure water jets （HPWJ） has been made in oil and gas well drilling, completion, and stimulation; and good results have been achieved in field applications. Advances in technologies and developments of well completion and stimulation with hydrajet are reviewed in this paper. Experiments were conducted to study the characteristics of abrasive water jetting and to optimize jet parameters, which can provide methods for the well completion and hydrajet fracturing. Deep-penetrating hydrajet perforating can create a 2-3 m clean hole with a diameter of 20-35 mm. Multilayer hydrajet fracturing is a process whereby multiple layers are stimulated in a single run without using mechanical packers, thereby reducing operation procedure and risk. Multilateral radial wells can be drilled using hydraulic jetting up to 100 m in length. The technique to remove sand particles and plugs with rotating self-resonating cavitating water jets in horizontal wellbores has been developed and oilfield-tested, which shows promising, cost effective prospects.

关键词： Water jet abrasive jet well completion perforation stimulation horizontal drilling with hydrajet

Mechanism and numerical simulation of pressure stagnation during water jetting perforation

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Petroleum Science 2008年第1期5卷 52-55页

作者： Huang Zhongwei Li Gensheng tian shouceng Shen Zhonghou Luo Hongbin Key Laboratory of Petroleum Engineering Ministry of Education China University of Petroleum Beijing 102249 China

When perforating with an abrasive water jet, it is possible that the pressure in the hole （perforation） will be higher than that in the annulus because of water jet blasting against the hole wall, which also is the theoretical basis for the technology of hydro-jet fracturing. This paper analyzes the mechanism of generating pressure stagnation in water jet hole, and puts forward a new concept of hydroseal. Then, the distribution of pressure in the hole was simulated with the finite element method. The simulation results showed that the pressure in the hole was higher than that in the annulus. Also, the lower the annular pressure （confining pressure） and the higher the blasting pressure, the greater the pressure difference. An experiment indicated that the cement sample was lifted up under the pressure stagnation in the hole, which proved the finite element simulation results obviously.

关键词： Water jet perforation pressure stagnation hydro-seal mechanism

Nanoscale mechanical property of marine and continental organic kerogen in shale

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Chinese Chemical Letters 2020年第2期31卷 509-512页

作者： Quan Xu Rui Zhang Mao Sheng shouceng tian Wuguang Li tianyu Wang Yilin Zhang State Key Laboratory of Petroleum Resources and Prospecting Harvard SEAS-CUPB Joint Laboratory on Petroleum ScienceBeijing Key Laboratory of Biogas Upgrading UtilizationChina University of Petroleum-BeijingBeijing 102249China Shale Gas Institute of Southwest Oil&Gas Field Company PetroChinaChengdu 610051China C.Eugene Bennett Department of Chemistry West Virginia UniversityMorgantownWest Virginia 26506-6045United States

Kerogen is known as an important organic part for absorbing and forming shale gas whose absorption function,especially mechanical and tribological properties,has not been fully ***,we use Fourier transform infrared(FTIR) and X-ray photoelectron spectroscopy(XPS) analysis to reveal the chemical structure of *** report the first study of the adhesion and friction behavior of kerogen using atomic force microscope(AFM) Nanoman *** finding reveals the friction of kerogen is decreased at higher pressure while is inhibited at increased temperature,and friction decreases logarithmically as the sliding speed *** weakened of Al-O linkage at high temperature have great influence on the decrease of friction forces between kerogen and alumina *** finding lays the mechanism for understanding the dynamic adhesion behavior of kerogen in frictions,therefore attracting increasing interests from scientists,researchers,petroleum engineers and investors.

关键词： Kerogen Friction Atomic force microscope Shale gas Mechanical property

Theoretical and experimental study of the pulling force of jet bits in radial drilling technology

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Petroleum Science 2009年第4期6卷 395-399页

作者： Ruichang Guo Gensheng Li Zhongwei Huang shouceng tian Xiaoning Zhang Wei Wu China Univ Petr State Key Lab Petr Resources & Prospecting Beijing 102249 Peoples R China

Radial drilling technology, of which the jet bit is the key device, is a research focus in the field of oil drilling and production. This paper establishes mechanical equations for jet bits and analyzes the hydroseal of backward jets in bottom holes. Meanwhile this paper establishes a mechanical equation for a high pressure hose and analyzes the axial force distribution. Laboratory experiments indicate that the flow rate, the angle between the backward nozzle axis and the jet bit axis, and the hole diameter are the major influencing factors; the generation of the pulling force is mainly due to the inlet pressure of the jet bit; the backward jets can significantly increase not only the pulling force but also the stability of jet bits. The pulling force would reach 8,376 N under experimental conditions, which can steadily pull the high-pressure hose forward.

关键词： Radial drilling water jet jet bit depression effect pulling force