冀东油田伴生气处理工艺技术研究
发布时间：2018-11-28 08:40
【摘要】：随着油田开发的不断深入,油田伴生气的组成、流量、压力等气质条件发生了较大变化,对处理工艺的适应性提出了更高的挑战。国内油田对伴生气的处理工艺以直接换热工艺(Direct Heat Exchange Process, DHX)为主,处理工艺单一,换热网络简单。亟需开发一种适用于油田伴生气的高效凝液回收工艺,提高装置对不同工况的适应性和装置整体经济效益,实现装置的高效、经济运行,具有非常重要的现实指导意义。 在调研国内外典型凝液回收工艺的基础上,深入分析了代表性工艺的优势和不足,总结了国外新工艺的改进措施和发展方向；重点调研了高尚堡油气处理装置的运行工况和丙烷回收率低的主要原因。 分析了常规DHX工艺的特点,确定了最优的增压方案,在应用两级分离、增设脱乙烷塔顶回流罐等措施进行工艺改进的基础上,提出了低温分离器液相进重接触塔方案和脱乙烷塔顶增设丙烷制冷器方案,确定了在脱乙烷塔塔顶增设丙烷制冷器的改进方案。运用基于夹点理论的换热网络模拟技术,建立了多股流冷箱的换热网络模型,明确了多股流冷箱的换热网络的优化方向,通过对冷箱内流股换热顺序的改进优化,提出了适用于油田伴生气的高效工艺——低温吸收回流工艺(The Low Temperature Absorption Reflow Process, LRP)。 基于炯分析理论评价了多股流冷箱换热网络的合理性,冷箱内各换热设备的换热(?)效率均达到95%以上,进一步验证了LRP工艺换热网络得到最大程度的优化。分析了LRP工艺对原料气气质组成和增压压力的适应性,LRP工艺对原料气气质条件的变化适应性强,LRP工艺特别适用于气质较富油田伴生气进行丙烷回收,当处理气质较贫的凝析气(C1/C2大于9)时,系统冷量充足,可取消脱乙烷塔顶丙烷制冷器。 针对冀东油田高尚堡油气处理装置存在的问题,提出了工艺参数优化方案和工艺流程改进方案。基于不改变流程及设备的前提下,应用流程优化技术对高尚堡油气处理装置进行工艺参数优化,分析了可调变量对优化目标的影响,建立了工艺参数优化模型,提出了工艺参数控制措施；基于开发的LRP工艺对其进行了工艺流程改进。在调研增加设备市场价格的基础上,对两方案进行了对比评价,应用LRP工艺的改进方案,丙烷回收率提高至98.6%,装置稳定性提高,每年可提高装置收益2083.3万元,经济效益可观。
[Abstract]:With the development of oil field, the composition of associated gas, flow rate, pressure and other temperament conditions have changed greatly, which poses a higher challenge to the adaptability of the treatment process. The main process of treating associated gas in domestic oilfields is direct heat transfer process (Direct Heat Exchange Process, DHX), the treatment process is simple and the heat transfer network is simple. It is urgent to develop an efficient condensate recovery process suitable for oil field associated gas, to improve the adaptability of the unit to different working conditions and the overall economic benefit of the unit, and to realize the efficient and economical operation of the unit, which has a very important practical significance. Based on the investigation of typical condensate recovery processes at home and abroad, the advantages and disadvantages of representative processes are analyzed in depth, and the improvement measures and development directions of new processes abroad are summarized. The main reasons for the low propane recovery rate and the operating condition of the oil and gas treatment unit were investigated. The characteristics of conventional DHX process are analyzed, and the optimal pressurization scheme is determined. Based on the application of two-stage separation and the addition of deethane tower top reflux tank, the process is improved. The scheme of liquid phase intake contact tower for low temperature separator and the scheme of adding propane cooler to the top of deethane tower are put forward, and the improved scheme of adding propane cooler to the top of deethane tower is determined. By using the heat exchange network simulation technology based on the pinch theory, the heat transfer network model of the multi-stream cooling box is established, and the optimization direction of the heat transfer network of the multi-stream cooling box is defined. Through the improvement of the heat transfer sequence in the cooling box, the optimization of the heat transfer sequence is obtained. An efficient process suitable for oil field associated gas, low temperature absorption and reflux process (The Low Temperature Absorption Reflow Process, LRP).), is put forward. Based on the theory of jiong analysis, the rationality of heat transfer network of multi-stream cooling box is evaluated, and the heat transfer of each heat exchanger in the cooling box is discussed. The efficiency is over 95%, which further verifies that the LRP process heat transfer network is optimized to the maximum extent. The adaptability of LRP process to the composition of feedstock gas and pressurization pressure is analyzed. The LRP process has strong adaptability to the change of gas condition of raw gas. LRP process is especially suitable for propane recovery of associated gas in oil fields with rich gas quality. When the condensate gas with poor temperament (C1/C2 > 9) is treated, the cooling capacity of the system is sufficient to cancel the deethane tower top propane cooler. In view of the problems existing in the oil and gas treatment unit of Haobu in Jidong Oilfield, the optimization scheme of process parameters and the scheme of technological process improvement are put forward. Based on the premise of not changing the process flow and equipment, the process parameters are optimized by using the process optimization technology, the influence of adjustable variables on the optimization objective is analyzed, and the optimization model of process parameters is established. The control measures of process parameters are put forward. The technological process was improved based on the developed LRP process. On the basis of investigation and research to increase the market price of the equipment, the two schemes are compared and evaluated. By using the improved scheme of LRP process, the propane recovery rate is increased to 98.6%, the unit stability is improved, and the unit income can be increased by 20.833 million yuan per year. Economic benefits are considerable.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE64
本文编号：2362376
[Abstract]:With the development of oil field, the composition of associated gas, flow rate, pressure and other temperament conditions have changed greatly, which poses a higher challenge to the adaptability of the treatment process. The main process of treating associated gas in domestic oilfields is direct heat transfer process (Direct Heat Exchange Process, DHX), the treatment process is simple and the heat transfer network is simple. It is urgent to develop an efficient condensate recovery process suitable for oil field associated gas, to improve the adaptability of the unit to different working conditions and the overall economic benefit of the unit, and to realize the efficient and economical operation of the unit, which has a very important practical significance. Based on the investigation of typical condensate recovery processes at home and abroad, the advantages and disadvantages of representative processes are analyzed in depth, and the improvement measures and development directions of new processes abroad are summarized. The main reasons for the low propane recovery rate and the operating condition of the oil and gas treatment unit were investigated. The characteristics of conventional DHX process are analyzed, and the optimal pressurization scheme is determined. Based on the application of two-stage separation and the addition of deethane tower top reflux tank, the process is improved. The scheme of liquid phase intake contact tower for low temperature separator and the scheme of adding propane cooler to the top of deethane tower are put forward, and the improved scheme of adding propane cooler to the top of deethane tower is determined. By using the heat exchange network simulation technology based on the pinch theory, the heat transfer network model of the multi-stream cooling box is established, and the optimization direction of the heat transfer network of the multi-stream cooling box is defined. Through the improvement of the heat transfer sequence in the cooling box, the optimization of the heat transfer sequence is obtained. An efficient process suitable for oil field associated gas, low temperature absorption and reflux process (The Low Temperature Absorption Reflow Process, LRP).), is put forward. Based on the theory of jiong analysis, the rationality of heat transfer network of multi-stream cooling box is evaluated, and the heat transfer of each heat exchanger in the cooling box is discussed. The efficiency is over 95%, which further verifies that the LRP process heat transfer network is optimized to the maximum extent. The adaptability of LRP process to the composition of feedstock gas and pressurization pressure is analyzed. The LRP process has strong adaptability to the change of gas condition of raw gas. LRP process is especially suitable for propane recovery of associated gas in oil fields with rich gas quality. When the condensate gas with poor temperament (C1/C2 > 9) is treated, the cooling capacity of the system is sufficient to cancel the deethane tower top propane cooler. In view of the problems existing in the oil and gas treatment unit of Haobu in Jidong Oilfield, the optimization scheme of process parameters and the scheme of technological process improvement are put forward. Based on the premise of not changing the process flow and equipment, the process parameters are optimized by using the process optimization technology, the influence of adjustable variables on the optimization objective is analyzed, and the optimization model of process parameters is established. The control measures of process parameters are put forward. The technological process was improved based on the developed LRP process. On the basis of investigation and research to increase the market price of the equipment, the two schemes are compared and evaluated. By using the improved scheme of LRP process, the propane recovery rate is increased to 98.6%, the unit stability is improved, and the unit income can be increased by 20.833 million yuan per year. Economic benefits are considerable.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE64
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