Study On The Long-Distance Rich Gas Transmission Technique In Tarim Gas-Condensate Fields

For rich gas transportations cheme, extraction of NGL from the natural gas is not required in the oilfield or gas condensate field, so the gas treatment processes in the field is simplified and the expense for the storage and transportation of NGL is saved. Rich gas can be transported in single phase at conventional pressure, in dense phase, or in two_phase. Herein, the technique of rich gas treatment is discussed and the technical characteristics of various rich gas transportation modes are compared. It is indicated that, to select rich gas transportation modes, the significant factors should be considered, such pipeline length, pipeline through put, composition rich gas (gas processingte chnique ), and limitation pipeline pressure at the inlet and outlet. Compare with long distance oil and gas mixing transportation longdistance rich gas transportation could be reliabte chnical scheme, provided that rich gas is desulfuized and dehydrated.The paper reviews foreign general situation of the long-distance rich gas transmission. It sums up the methods based on PR and SRK state equations for calculating phase equilibrium, density, enthalpy and other parameters as well as the improved prediction hydrate models set up by Parrish-Prausniz and Holder.Rich gas transmission Software is developed based on the equations and methods. In accordance with basic data and environmental condition of the YingMai-7 gas-condensate field group, the paper comes up with some process schemes for natural gas gathering, treatment and transport.Meanwhile, the paper also plans to phase construction of the ground, as well as in recent years, the Tarim Oilfield Company of the actual construction costs, against the British Gas Group to buy seven gas-rich foreign pipeline construction program, China's oil use existing "construction project economic evaluation methods and parameters (exploration and development pipeline)," provides comprehensive financial means superscript evaluation. The results showed that the gas-rich long-distance carrier has good economic returns, from a financial perspective, the project economically viable.