FUZZY EVALUATION METHOD TO OPTIMIZE WATER-DRAINAGE AND GAS-PRODUCTION PATTERNS IN COALBED GAS WELLS

For coalbed gas wells,the water-drainage and gas-production facilities are very similar to those for conventional oil and gas wells.There are many problems,further affecting production effect of coalbed gas.In this study,every water-drainage and gas-production pattern is analyzed at first;and then,integrating with theory of fuzzy mathematics,a model to evaluate these patterns is established through fuzzy evaluation method;thirdly,fuzzy evaluation on in-situ patterns is carried out technologically and economically;finally,the optimum pattern is selected.Results show that the selected one is available.