Study On Technology Of Associated Gas Treatment In Jidong Oilfield

With the deepening of oilfield development, great changes have taken place in the composition, flow rate and pressure of the oilfield associated gas. These changes put a higher challenge to the treatment processadaptability. Treatment process of domestic oilfield associated gas is mainly single expanding refrigeration technology and direct heat exchange process (DHX).The problems of the domestic treatment process lie in the single treatment process, low temperature integration degree of the system, low recovery rate of propane, poor t economic benefits of the whole device.It is necessary to develop an efficient condensate recovery process which is suitable for oilfield associated gas, improving the adaptabilityto different conditions and the overall economic efficiency, implementing the efficient and economic operation of the unit. This process will has a very important practical significance.Based on the research of domestic and international typical condensate recovery process, in-depth analysis the advantages and disadvantages of the representative technology, then summarized the improvement and development direction of the new technology abroad. Focuses on the investigation of the operating conditions and reasons whypropane recovery rate is lowof the Gaoshangpu oil and gas processing device.Analyzing thecharacteristics of conventional DHX process, determined the optimal pressurization scheme. Based on the improved process which applied a two stage separation process and added a deethanizer reflux tank, two kinds of improved schemes was proposed, one is the low temperature separator liquid into the heavy contact tower, and the other is adding a propane refrigeration of the deethanizer. Starting from the propane recovery rate and stability of the system point of view, addinga propane refrigeration of the deethanizerhas been determined to be the improvement scheme.Using the heat exchange network simulation based on the theory of the pinch point technology, established the thermal network model of the improve process, made clear of the optimization of multi-stream cold-box heat exchanger network improvement direction.Through the improvement of the orderof the cold box stream, successfullydeveloped the low temperature absorption return reflow process (LRP)Evaluating the rationality of the multi-stream heat exchanger networksbased on exergy analysis theory, the heat exchange exergy efficiency of the heat exchange equipment inside cold boxwere above98%, the original heat exchanger network is optimized to the maximum extent. Analyzing the adaptability of the low temperature absorption reflow process in different kind of gases, the propane recovery rate reached more than95%in different gas,it has strong adaptability of different raw material. When the C1/C2is greater than9and thesystem cooling capacityis adequate, propane cooler on the deethanizer can be cancelled.In view of the existing problems of the Jidong Oilfield Gaoshangpu oil and gas processing device, put forward the optimization of the process parameters and process improvement plan. Based on the premise of not changing the process and equipment, optimizing the process parameters of Gaoshangpu oil and gas processing device applied the process optimization technology. Analyzing the influence of the adjustable variables of the optimization objective, establishing the parameter optimization model, thus put forward a control measuresof the process parameters; developed the improvement process of the LRP process. In the investigation of increasing equipment market prices, compared the two plans, the improved LRP technology makethe propane recovery rate increased to98.6%, improving the stability of device, increasing the income of the whole device for20.833million yuan per year.