﻿ 煤层气直井排采初期水力模型的建立

# 煤层气直井排采初期水力模型的建立Coalbed Methane Vertical Well Production Hydraulic Model Building

Abstract: In order to study the prediction model of gas production of CBM wells in the drainage process with the shortage of geological data, we calculated the transmissibility of reservoir and the conical de-pression influence radius of water cone by using Theis formula and Jacob formula, calculated the critical desorption pressure by using Langmuir formula and calculated the desorption radius of CBM wells by integral. We founded the simulation results and the actual production curve with a better fit degree by model building and gas production fitting of single well. The result showed that there is a linear relationship between the bottom hole pressure in different production stages and water production. The conical depression influence radius of water cone and level drawdown shows a logarithm relationship, and it shows a exponential relationship with the production time. The transmissibility and the influence radius have the greatest effect on the gas production in the objective factors.

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