威远页岩储层特征对测试产量的影响

Influences of shale reservoir characteristics on production test in Weijyuan block

为了更好地实现威远页岩气田地质工程一体化开发,在区块地质特征和储层特征等研究基础上,探索储层特征对压裂施工和测试产量的影响,建立了测试产量的静态评价模型。研究结果表明,威远202井区页岩脆性指数越高,停泵压力越低;水平应力差异系数越低,停泵压力越低。威远202H2平台压裂施工研究发现,离裂缝带越近,停泵压力越低。研究表明威远区块页岩气水平井临界钻遇率与临界改造长度分别为80%和1250m,最终建立了威远202井区测试产量与储层改造长度回归模型,计算的测试产量与实际测试产量误差小,预测的测试产量主要可用于评价早期气井产能,为随钻地质导向、压裂施工提供理论和实践依据。

In order to realize geology-engineering integration on the development of Weiyuan shale gas field,base on the geological and reservoir characteristics,the influences of reservoir characteristics on fracturing stimulation and production test were analyzed,and then a static model for estimating the rate of production test was established.Our study shows that,in wellblock Weiyuan 202,the shut-in pressure decreases with the increase of shale brittleness index and the decrease of horizontal stress difference coefficient.Fracturing operation on pad Weiyuan 202H2 shows that the closer to the fracture zone,the lower the shut-in pressure is.It is concluded that the critical drilling meeting efficiency rate and critical stimulated section of a horizontal shale gas well are 80%and 1250 m,respectively,in Weiyuan block.Finally,a regression model was established for estimating the testing production in Wellblock Weiyuan 202.The error between calculated production and actual production is small.Prediction of testing production is used to evaluate early well production and provides theoretical and practical basic data for geosteering while drilling and fracturing operation.