Influences of shale reservoir characteristics on production test in Weijyuan block

doi:10.3969/j.issn.1672-7703.2019.04.014

Abstract

Abstract: 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.

CLC Number:

Li Mingbo, Wu Zhiwei, Zhang Jinwu. Influences of shale reservoir characteristics on production test in Weijyuan block[J]. China Petroleum Exploration, 2019, 24(4): 539-546.

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