The software can simulate the operation status of the gas reservoir, wellbore and ground gathering system from the steady state or pseudo-steady state of the gas reservoir. The Bubble map of the system can directly see the back pressure of each gas well according to the pressure range represented by the color.
Second, the main steps and processes of application 1. Drawing a sketch of the pipe network Before the pipe network model is established, in addition to a very simple pipe network, a pipe network sketch should be drawn. The sketch should correctly represent the parameters and connection relationships of the actual pipe network components, as well as the name and main constraints of the model components.
2. Establishing the collection pipeline network model FAST Piper's collection pipeline network model is established by inputting the parameters of the relevant model components. After inputting the parameters of the model components, the pipeline network model is automatically generated. The following details should be noted during the modeling process.
3. Correction of pipeline-related operational parameters After establishing the model of the gathering system and selecting the appropriate pressure drop correlation, in order to ensure the accuracy of the calculation, if the actual operational data should be used to calculate and correct the model using smooth operational data, and The correctness of the model can be verified. Adjust the Flow Eff of the Gathering system interface so that the pressure of the corresponding pipeline in the actual pipeline is consistent with the actual pressure for subsequent calculation. Due to factors such as the undulation of the pipeline, the roughness of the inner wall, and the difference in the transport medium, it is necessary to calculate as accurately as possible, and it is necessary to use the actual operational data for correction and fitting.
4. Simulation calculation After inputting parameters such as gas well production or fixed point gas production and treatment plant inlet pressure in the interface of the corresponding variable model model of the established pipe network gathering and transportation model, the calculation and prediction can be started. Below it shows the calculation process and the time it takes to complete the entire calculation.
5. Calculation result output can print out the calculation result and the collection system diagram, result diagram, and so on. Which parameters are printed out and output are set on the interface diagram of the gathering system. The flow direction, speed, size, conveying efficiency and pressure loss of the pipeline can be visually seen from the result graph.
Third, the application example 1. Gathering system node pressure prediction By using FA ST Piper gathering and analysis optimization software, it can predict the operating pressure of each node and the operation of the gathering pipeline network system under the corresponding gas production, so that the gas well production capacity can be fully exerted. Provide a basis for production arrangements and organization to ensure safe and smooth operation of the gathering system. A comparison chart of the operating pressure and actual operating pressure of the Donggan line node in Jingbian gas field at a certain stage predicted by FAST Piper software. It can be seen from the figure that the actual operating pressure of each gas gathering station is basically in agreement with the predicted pressure, and the maximum deviation does not exceed 0.12 M Pa.
2. Multi-program calculation and optimization The large-scale transmission network system can have multiple modes of operation, but in order to find the best operation plan, it must undergo scientific analysis and calculation.
There are many cut-off points on the regional pipe network in the southern part of Jingbian gas field. The gas production can be transported to two purification plants. By using FAST Piper software analysis, the gas is cut off from the Wangjiazhuang pig control station, and the natural gas streams on both sides are separately fed into the corresponding purification plant. The purification plant operates within the processing capacity load range, and the gas gathering station does not overpressure, and the gas well production capacity can be fully utilized.
3. Under abnormal conditions, the operation status of the pipeline network may simulate the gas transmission trunk line or the treatment plant in the gas field gathering and transportation system, and there may be maintenance and accident shutdown. In order to enable the production unit to grasp the impact of different situations on external gas supply, it is necessary to analyze and study the operation status of the gathering system under such circumstances.
4. Ring pipe network calculation and analysis The ring pipe network is usually a difficult point of manual calculation. A simpler annular pipe network can balance the system by adjusting the amount of gas delivered; but for a more complex annular pipe network, manual calculation is not only time-consuming and laborious, but also inaccurate. Using FAST Piper's Gathering and Analysis Optimization Software, you can easily build models and perform calculations. It can be seen from the calculation result interface that the airflow direction is intuitive, and the air volume on the corresponding pipeline of the annular pipe network can also be easily read out.
5. Application on the gas distribution pipe network The software can also be applied on the gas distribution pipe network. The user needs to be defined as a compressor (one for each user). The suction pressure of the compressor is the pressure of the natural gas entering each user. A virtual processing plant must be established downstream of the compressor (the software requires that the collection system must have and only allow There is a delivery point). Given the gas distribution pressure of the gas distribution station and the pressure to the user, the gas supply capacity of the pipeline to each user can be calculated.
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