Research On Production Variation Of Pressurized The Exploitation Phase In Low-permeability Carbonate Gas Reservoir

Jingbian Gas Field is located in the the center of E er duo si basin, Department of the low permeability, low abundance and low-yielding for large-area composite contiguous carbonate gas reservoir.after ten years of development, some gas well of the wellhead pressure is lower than or close to the operating pressure of the pipe network, numerical simulation predict, supercharged exploitation can continue to maintain a stable production of gas field. However, the lack of mature technology for the pressurization of the gas field exploitation of the effect evaluation.This article is based on the geological characteristics and test data for a typical block, Exploitation of old wells in the continuous liquid carrying the theory and sensitivity analysis on the basis of the typical district9supercharger wells, using the method of numerical simulation to determine the gas well in the critical liquid carrying traffic on the basis of a reasonable yield of supercharged exploitation; In this paper, the dynamic data of gas reservoir production is fully used to establish reserve evaluation methods controlled by gas wells including the dynamic material balance method, through re-organize pressure and flow rate to exchange the variable pressure/flow rate production data to equivalent constant pressure/flow rate data basing on conventional pressure drop evaluation method and the adaptability of two method are clearly defined. Thus the dynamic evaluation methods of reserve controlled by gas wells adapt for the Jingbian natural gas field are formed. analysis of the actual production decline rate and single well numerical simulation decreasing rate analysis showed that the law of diminishing is not evident under the supercharged exploitation, but descending from a straight line descending into the hyperbolic decline, indicating that compared with the yield variation of the6.0MPa, the latter Decrement is slowing down under the2.5MPa; in certain production allocation conditions, with the increase in wellhead pressure, the gas well stable end of the production decline rate is increasing, when the wellhead pressure is stable, with increased production gas well stable end of the production decline rate is increasing, decreasing rate is decreased gradually over time.Finally, the gas reservoir engineering and numerical simulation techniques topredict the effect on pressurized exploitation, preferably the wellhead to controlpressure in the wellhead pressure is reduced to2.0MPa, the recovery can be increasedby7%. Tentatively identified the gas field booster exploitation evaluation methodsand provide a technical basis for the low-permeability carbonate gas reservoir effectevaluation.