低渗透气井工作制度对试井解释的影响

为了得到低渗透气井正确、可靠的试井解释结果 ,根据不稳定试井理论 ,结合矿场实际测试数据分析 ,认为低渗透气井要以合理的工作制度测试 ,做到产气量与气藏供气能力相匹配 ;否则 ,如果低渗透气井工作制度不合理 ,即产气量过大时 ,会造成气藏供气能力不足 ,供不应产 ,导致压力半对数曲线出现明显的“假径向渗流”直线段 ,由此解释得到的地层系数、渗透率等误差较大、失真 .进一步完善了低渗透气井试井测试条件

Effect of the Well Testing Production Plan of a Low Permeability Gas Well on Well Testing Interpretation

According to the theory of unstable well testing and the analysis of a large quantity of data obtained in field, the authors hold that in well testing, the gas production of a low permeability gas well should match with the gas supplying capacity of the gas reservoir; otherwise, it is impossible to obtain the correct and reliable result of well testing interpretation. If the gas production is greater the gas supplying capacity, the straight line segment of "false radial seepage flow" will appear in pressure semilog curve. The gas supplying capacity and permeability of the gas reservoir obtained from the false pressure semilog curve will have great error.