Papers by Keyword: Thermal Recovery

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Authors: Chuan Jun Li, Wan Wan Huang, Zhi Qiang Wang, Kai Li, Bin Han
Abstract: In order to intelligently switch the working status of production string between oil production and testing in the heavy oil thermal recovery, as well as to improve oil exploit efficiency and reduce the exploitation cost, a new transformation joint was designed. Based on the hydraulic fluid controlling principle, caused by the one-way valve opening and closing, the positive and reverse pressure pushed the sealing cylinder to the left or the right. And the transformation between the two states could be achieved. The K-ε model of CFX software was used to simulate the internal flow field of the device under four different opening status of the one-way valve. By analyzing the distributions of pressure and velocity, the energy loss of the device in the oil state was gotten, and the method were found to optimize the design of the flowing channel for reducing the energy consumption. The results show that the design of the device satisfies the operation requirements of thermal recovery, the means to further improve the device is obtained, and it significantly improves the efficiency of measuring oil reservoir parameters.
Authors: Jin Bao He
Abstract: The major method for developing heave oil is steam soak/steam injection technology. During the steam injection, inner zone radius increased; while during shut in, inner zone radius decreased, in order to find the effect of removable inner zone radius on well testing analysis, we developed a new mathematical model with two zones and the inner zone radius is removable with time. The well bore storage and skin effect are considered. The well bore pressure response solution was obtained by using Laplace transform; typical curves were made by using Stehfest Laplace numerical inversion algorithm. The feature of the typical curves were analyzed and compared with those base on the conventional model. Based on this model, the movement feature of heating front during steam injection /soak can be evaluated.
Authors: Yun Xiao Ding
Abstract: In this paper we develop an adaptive mesh refinement (AMR) algorithm for solving the non-isothermal three-phase flows in heterogeneous porous media such as steam flooding in heavy oil reservoir. This porous media are made up of different rock types. The refinement criteria are proposed to overcome the difficulty that the saturation is discontinuous across the interface of two different rock types. Since the ratios of relative permeability between different rock types are found to be continuous, they are chosen as the control parameters to perform the refining and coarsening operations. The numerical examples show that the proposed AMR algorithm is fast with good accuracy.
Authors: Hai Bin Chen, Nan Ge, Qing Jie Zhu
Abstract: In steam injection wells, the temperature of heat steam is very high and casing is heated during steam injection process, which has become the main reason of casing damage. Therefore, finite element model is very important to analyze the thermal mechanical coupling and casing damage in steam injection wells. Three-dimensional finite element model is investigated; geometry model is constructed with native and parasolid method in ADINA. The casing is modeled by native method and strata are modeled by parasolid method, casing is subtracted and merged with strata by Boolean Operation. Comprehensive loads are defined in structure model, and temperature load in thermal model. In thermal model, all materials are treated as heat conduction material. Thermal-mechanical coupling and casing damage are calculated with finite element model of thermal-mechanical coupling. According to the calculating results, the mechanism of casing damage is analyzed. Finally, some advice is proposed to the protection of casing in steam injection wells.
Authors: Yun Long Cheng
Abstract: SAGD dynamic temperature and pressure monitoring technology can be used to detect multi-point temperature and pressure in production well, determine liquid state, accurately identify the movement direction of steam and breakthrough position so that it can effectively guide SAGD production and reduce operation costs, thereby significantly improve heavy oil recovery.
Authors: Feng Yu Wen, Qiang Wang, Xian Bin Dong, Hong Liang Ma, Gang Tian
Abstract: A high level of oxygen in boiler supply water would lead to oxidation corrosion of the boiler tubes. Reduction of the boiler tube thickness will affect its service life even result in such serious accidents as tube explosion. In S oil-field, a combining measure of physical and chemical methods were adopted to improve deaerator technology. A relatively complete ground deaeration process is formed. The deaeration system consists of water ring vaccum pump, deaeration tank, booster pump, circulating tank, etc. First softened water processed by softener would flow through 80 mesh stainless steel screen filter. Then in high vacuum deaeration tank, the water will be ejected in a spray due to the eddying flow of the nozzles and size of the droplet can reach 30 micrometer. Oxygen partial pressure in the tank is in a minimal level so that dissolved oxygen in the water-drops can be released. The steam and released oxygen will be sent to circulating tank for recycling. Deoxidation rate of the process can be above 95% and residual dissolved oxygen can be removed by chemicals. So the boiler supply water can meet technical requirements. The deaeration system has a good application in boiler supply water deaeration in S oil-field. Practical application shows the deaeration system has characteristics of stable performance, mainly maintenance-free, and good adaptability to some poor-quality water. So the deaeration system has a good promotion value.
Authors: Yu Heng Zhu, Bao Liang Liu
Abstract: Steam generation and injection in thermal recovery station constitute a very complicated HPHT system, mainly including power supply, water supply and treatment, fuel oil or gas regulation, steam and gas separation, safety and protection etc. To ensure normal operation of the system and realize centralized intelligent management and control, Modbus communication technology is used for configuration and connection of hardware and selection of software. The result shows that sub-systems of steam injection station such as intelligent power supply etc are well integrated.
Authors: Yu Long Zhang, William J. Weber, Weilin Jiang, Anders Hallén, G. Possnert
Authors: Chuan Jun Li, Wan Wan Huang, Bin Han, Kai Li, Shu Wen Liu
Abstract: In order to improve the efficiency of the heavy oil thermal recovery in high temperature and high pressure conditions, a new transformation joint was designed based on the theory of fluid pressure difference. Through the automatic displacement of a one-way valve and a seal tongue under the action of pressure difference, it realized intelligent transformation between the production status and the well testing status. According to the oil recovery requirements about structure size, energy loss, high temperature sealing property and high temperature resistance, thermal expansion of material, designs about structure, key sizes, material model and sealing parts were carried out, and strength of key parts was verified theoretically. Fluent was used to simulate the internal flows of the structure, to analyze and verify the energy loss under the working status. The result shows that the product can meet the requirements of heavy oil exploitation, and its simple structure, high reliability and strong durability can greatly improve the efficiency of crude oil recovery.
Authors: Masashi Suezawa, Koji Sumino
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