Investigation of the hydrate reservoir production under different depressurization modes     

Zhizeng Xia  Xuewu Wang  Xiaohua Zhang 《Marine Georesources & Geotechnology》2020,38(8):1002-1012

Abstract

Large reserves of natural gas hydrates exist, and the depressurization method has the greatest potential for gas hydrate reservoir recovery. Currently, the most commonly adopted depressurization simulation method is a constant bottom-hole pressure production scheme. This study proposes a new depressurization mode with decreasing bottom-hole pressure. The production characteristic was numerically investigated using this method. The results show the following: (1) As the depressurization exponent (n) decreases, the development effect improves, and production indexes including cumulative gas production/dissociation and gas-water ratio increase. However, the reservoir energy consumption is higher and the hydrate reformation is more severe. (2) Compared to the proposed depressurization mode, the hydrate production index of the constant bottom-hole pressure production (n?=?0) is better. However, the hydrate reservoir energy consumption is higher and the hydrate reformation is more severe using constant bottom-hole pressure production. (3) To achieve a balance between production and reservoir energy consumption during depressurization production, the bottom-hole pressure should be controlled by selecting a suitable depressurization exponent between n_min and n_max, which can be determined through numerical simulations.  相似文献   

Equilibrium constants of triethanolamine in major seawater salts     

I. Brandariz  P. Castro  M. Montes  F. Penedo  M.E. Sastre de Vicente 《Marine Chemistry》2006,102(3-4):291-299

Acid–base equilibrium constants of triethanolamine (TEA) have been determined by potentiometric titrations with a glass electrode, at 25 °C. Ionic strength was kept constant with only one electrolyte (using one of these salts: NaCl, KCl, MgCl₂ or CaCl₂), with binary mixtures of MgCl₂ and CaCl₂, and finally, in a solution with a composition approximately similar to that of natural seawater without sulfate. Equilibrium constants have been expressed in function of ionic strength by means of Pitzer equations and interaction parameters proposed in this theory have been obtained. It has been found that acid–base behaviour of TEA depends greatly on the salt used: basicity of TEA is decreased by CaCl₂, while it is increased by the other electrolytes used in this work.  相似文献   

Modelling the effect of swimbladder compression on the acoustic backscattering from herring at normal or near-normal dorsal incidences     

Gorska  Natalia; Ona  Egil 《ICES Journal of Marine Science》2003,60(6):1381-1391

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The target strength of Antarctic krill (Euphausia superba) measured by the split-beam method in a small tank at 70 kHz     

Amakasu  Kazuo; Furusawa  Masahiko 《ICES Journal of Marine Science》2006,63(1):36-45

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Relationship between acoustic backscattering strength and density of zooplankton in the sound-scattering layer   总被引：1，自引：0，他引：1  

Iida  Kohji; Mukai  Tohru; Hwang  DooJin 《ICES Journal of Marine Science》1996,53(2):507-512

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The acoustic target strength of herring (Clupea harengus L.) in the northern Baltic Sea   总被引：1，自引：0，他引：1  

Peltonen  Heikki; Balk  Helge 《ICES Journal of Marine Science》2005,62(4):803-808

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Comparing the modelled and measured target-strength variability of walleye pollock, Theragra chalcogramma     

Hazen  Elliott L.; Horne  John K. 《ICES Journal of Marine Science》2004,61(3):363-377

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New target-strength model indicates more krill in the Southern Ocean   总被引：5，自引：3，他引：5  

Demer  David A.; Conti  Stephane G. 《ICES Journal of Marine Science》2005,62(1):25-32

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Effect of Sea Level Variation on Tidal Characteristic Values for the East China Sea     

于宜法  俞聿修  左军成  万振文  陈宗镛 《中国海洋工程》2003,17(3)

1 .IntroductionTheglobalairtemperatureroseabout 0 .5～ 0 .6°Coverthepast 2 0thcentury ,andtheglobalmeansealevelincreasedbyabout2 0cmduringtheperiod .Theregionalmeansealevelriseswiththerisingglobalmeansealevel.Zuoetal.( 1 997)indicatedthatthemeanrisingrateofabsolutemeansealevelalongtheChinacoastontheassumptionofunifiedisostaticdatumis 2mm a .Woodworth( 1 999)analyzedsealevelspanning 1 76 8tothepresentinLiverpool,andobtainedaseculartrendforheperiodupto 1 880of0 .39± 0 .1 7mm a ,andatrendfort…  相似文献   

复合加载条件下吸力式沉箱基础承载特性数值分析   总被引：2，自引：0，他引：2  

王志云  王栋  栾茂田  范庆来  武科 《海洋工程》2007,25(2):52-56,71

吸力式沉箱基础的承载特性是海洋工程结构设施建造与设计中的一个关键问题。这种新型的深水海洋基础型式,通常承受竖向上拔荷载与水平荷载的共同作用,其工作性能与设计理论远远不能满足工程实践的需要。本文采用有限元分析方法对吸力式沉箱基础的极限承载特性进行数值计算。以大型通用有限元分析软件ABAQUS为平台,通过二次开发,数值实现了Swipe试验加载方法和固定位移比分析方法,针对不同的沉箱长径比、土的强度折减系数,探讨了沉箱基础在垂直上拔荷载和水平荷载单调联合作用下的极限承载力,通过对不同荷载组合的数值计算构造了复合加载条件下沉箱基础破坏包络面。  相似文献