Most gathering-transportation projects in tight gas fields feature high investment, long construction period and numerous influencing factors. Their objective evaluation is related to the overall field development and construction. So, YQ2-Y128 well area was taken as an example to analyze both advantages and disadvantages of three gathering-transportation processes under high, medium and low pressure. Based on analytic hierarchy process (AHP), an evaluation system was established to select three first-grade evaluation indexes (production safety, process technology and economic benefits) and ten second-grade ones (throttle failure, liquid accumulation, pipe network pressure loss, gas-gathering radius, operating pressure, land acquisition, metering error, internal rate of return, investment, and operating costs). In addition, the weight was determined for each index by using AHP, and the method of grey correlation analysis (GCA) was adopted to evaluate these three processes. Results show that (i) the determined indexes rank in an order of descending weight, namely internal rate of return, investment, throttle failure, pressure loss, operating cost, gas-gathering radius, liquid accumulation, operating pressure, land acquisition, and metering error; and (ii) the obtained weight from AHP is introduced into GCA to determine the grey correlation for these processes one by one. As a result, it is determined that, as the optimal one, the gathering-transportation process under medium pressure enjoys the highest correlation. The research results can provide an evaluation means and reference for the objective comparison and decision of gathering-transportation processes in tight gas fields at home and abroad.
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