CALCULATION OF DEGREE OF COMPRESSION OF GAS AT THE COMPRESSOR STATION AT UNPROJECT MODES OF PUMPING OVER

Abstract

A significant proportion of the time of trunk gas pipelines (MG) operate with a capacity different from the design values. Reasons for this situation are: changes in amounts of gas production from the fields, unevenness, failure of the linear part of the pipeline or compressor stations. In all these cases it is necessary to regulate the work of the COP. The challenge put pressure balance equation at the beginning of the linear portion of main gas pipelines. Unfortunately, in this formulation, the problem is still not solved. Only estimates were obtained according to the performance of finding the main gas pipeline, which will install it when you turn off the individual COP or gas pumping units (GPU). However, these formulas are impaired due to the use is not quite correct dependencies describing the change of pressure in the linear portion of the pipeline and on the discharge side of the COP. In the first case, the pressure drops due to a dust collector and AVO gas in the second - erroneously introduced a term that takes into account the change in the gas flow rate, although this factor takes full account of the variable compression ratio. The proposals on the definition of the required degree of compression of the gas in the regulation of the operation mode of the COP MG in the following situations: disabling interim COP; increase productivity by building MG additional COP, changes in operating pressures of MG and gaskets looping. Found the necessary degree of gas compression should be used in determining the required rotor speed TSBN. In conclusion, provides examples of calculations that illustrate the application of these methods for regulation of compressor stations.