دانلود رایگان مقاله انگلیسی شبیه سازی سیستم تولید متان کبالت و پیش بینی تحویل پذیری: محاسبه مخزن/چاه/شبکه سطح جفت شده به همراه ترجمه فارسی
عنوان فارسی مقاله: | شبیه سازی سیستم تولید متان کبالت و پیش بینی تحویل پذیری: محاسبه مخزن/چاه/شبکه سطح جفت شده |
عنوان انگلیسی مقاله: | Coalbed Methane Production System Simulation and Deliverability Forecasting: Coupled Surface Network/Wellbore/Reservoir Calculatio |
رشته های مرتبط: | مهندسی نفت و مهندسی مخازن |
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توضیحات | ترجمه این مقاله به صورت خلاصه انجام شده است. |
نشریه | هینداوی – Hindawi |
کد محصول | f410 |
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بخشی از مقاله انگلیسی: 1. Introduction CBM is one of the most important sustainable energy for the strategy of sustainable development in the 21st century. China is abundant with CBM resource. About 36.81 trillion cubic meters is stored in depth of less than 2000 m under the ground in the field [1]. The wells are intensively distributed in the on-site CBM blocks. The gas production and pipeline operation parameters for undergoing construction project could be predicted by the integration of surface/wellbore/surface pipeline network to get closer to the actual production data, which optimizes and guides the CBM surface construction and improves the production to maximize the industry economic benefit. Over the past few decades, many scholars have been studying the integration of the oil and gas production system and several models have been put forward. Dempsey et al. [2] first studied the coupling of gas reservoir flow simulation and surface system simulation, which built the foundation of other relative research on the production system integration. Startzman et al. [3], Trick et al. [4], Litvak and Darlow [5], Coats et al. [6], Al-Mutairi et al. [7], and Guyaguler et al. [8] also put forward their models of the reservoir/wellbore/surface system integration afterwards. Startzman et al. [3] proposed a model of reservoirto-surface system coupled simulation, but this model only applied to the development of large offshore oil fields and the scope of application was narrow. Trick et al. [4] combined the black oil reservoir simulation software IMEX and the ground system simulation software FORGAS for forecasting the production of gas field. The coupling process of these two models is applicable to the coupling of any reservoir simulator with the ground system model which includes bottom-hole inflow dynamic curve and bottom-hole pressure loss calculation module. Litvak and Darlow [5] studied the coupled model of reservoir and ground pipe network and proposed an implicit method to solve the network node and the reservoir grid. Coats et al. [6] proposed a model of the reservoir/wellbore/surface system integration. The model considered the complex condition of wellbore size and the down-hole equipment and solved the entire system at every step of the Newton iteration. Al-Mutairi et al. [7] calculated the IPR curves by using the pressure in the nearwell drainage area, which overcome the shortcomings of previous sensitivity to the variation of well production when calculating the IPR curves using the grid parameters of reservoirs. Guyaguler et al. [8] proposed a similar approach, but in this method each subdomain needs to be solved repeatedly before reaching equilibrium, and then when the final equilibrium is reached the IPR curve that can reflect the condition of near-well reservoir is obtained. Although this method is time-consuming and the amount of calculation is large, it can reduce the balance error. The IPR curve method is mainly used for the conventional reservoir simulation and the unconventional gas reservoir numerical simulation method is time-consuming. Combined with material balance method for isothermal adsorption of coalbed methane, this paper proposes a method to meet the need of unconventional coalbed methane integrated simulation coupling CBM considering network model, wellbore pressure drop, CBM adsorbed state, and its drainage gas recovery mechanism 2. Model Description 2.1. Wellbore Model. Coal reservoir and surface pipeline network was connected by CBM wellbore. The wellbore flow parameters directly affect gas production and surface network flow state. In the process of CBM production, the production is directly determined by bottom-hole flow pressure (BHFP). Figure 1 shows the annulus fluid distribution in the CBM wellbore. Gas and water enter the surface system from the annulus and tubing, respectively. Fluid in annulus can be distinguished by working fluid level as the gas column in the upper level and aerated fluid column in the lower level. Wellbore annulus pressure drop consists of the pressure drop of both parts. Many researches about calculation of BHFP had been suggested. |