Study On Production System Of Water And Water Production

At present, the technology of the horizontal well has become the important measures to improve the gas well production in the world, but in the mid-late reservoir exploration, formation began to produce water, what will not only seriously affect the gas well production capacity, but also have a larger impact on the implementation of the field development plan, how to maintain the horizontal well production status has become an important issue, what we have to face, so study on production system of gas water horizontal well has important significance to play the horizontal well’s favorite benefits and advantages.This paper lets gas water two-phase flow as the research object, on the bases of the equivalent flowing resistance method the paper establishes Productivity model of gas water horizontal well, and analysis the influence factors. The paper summarizes the division of two phase flow model in horizontal well and flow pattern transformation rule, and analyzes the production system of gas water horizontal well. This paper establishes a new way to optimal parameters of the gas water horizontal well, the result was compared with the not considering product water. Based on the research of the above several aspects, the paper achieves the following achievements:(1) According to the laws of the gas water two-phase flow, the paper establishes production model of as water horizontal well, which lay the theoretical foundation on analysis production system of horizontal gas well.(2) The paper summarizes the division of two phase flow model in horizontal well and flow pattern transformation rule which lay the theoretical foundation on selecting of the coefficient of friction when we study pressure distribution in the wellbore.(3) The gas water horizontal well pressure distribution model of vertical well section and deviated well section is established. The calculation results show that the vertical well and deviated well section stress is linear distribution along the well depth, and is gradually increasing with the increase of the depth.(4) By coupling the formation flow and variable mass flow in the horizontal wellbore, the paper establishes the analysis model of inflow performance of gas water horizontal well, attains the horizontal wellbore pressure distribution law through calculating the model by programming.(5) By using water correction factor to correct model of Thornhill&Graver, we got a suitable new model for two phase throttling calculation.(6) Through establishing the parameter optimization method of gas water horizontal well produce system, the paper study on sensitivity analysis and optimal parameters(tubing diameter, wellhead pressure, skin factor, diameter of gas nozzle).(7) Relative to two-phase horizontal well production system, the result of reasonable parameters should be smaller by using the single-phase horizontal well production system, which makes gas well waterout because of not removing liquids from gas well. In conclusion, this article research results have important reference value for quickly finding out the factors restricting output, changing the horizontal gas well production status, making sure reasonable working system.