An Analysis of Main Controlling Factors of Production for Horizontal Shale Gas Well in Weiyuan Block

doi:10.11885/j.issn.1674-5086.2019.07.01.01

Abstract

Abstract: Pilot development in the Weiyuan national shale gas demonstration area in the Sichuan Basin but the test production rates of different wells show a great variety. In view of this, the research focuses on the main factors controlling the high production of horizontal shale gas wells in this area. Using the geological and logging date of coring wells confirm that Long I₁¹ sublayer of Longmaxi Formation is the best development strata. Combining detailed reservoir studies fracturing evaluation of horizontal wells, we establish the relationship between reservoir thickness, optimal target position, the drilling rate of Type I reservoirs and the production of gas wells, and confirm the natural fracture development and its impact on horizontal well productivity.The relationship between the effectiveness of the fracture network and fluid volume, sand volume and pipe rate was calculated. The results indicate:(1) there is a highly positive correlation between the thickness of the Long I₁¹ sublayer and production; (2) distance from the bottom of Long I₁¹ sublayer 0～4 m is the optimal target position; (3) the drilling rate of Type I reservoirs has a direct effect on the high production of gas wells; (4) the natural fracture development are highly relate to single well production; (5) the defines the comprehensive coefficient of fracture network is above 0.8, which can provide effective channel for shale gas flow after fracturing.

Key words: Weiyuan Block, horizontal wells production, high-quality reservoir thickness, optimal target position, drilling rate of Type I reservoir, natural fracture, comprehensive coefficient of fracture network

CLC Number:

TE122

CHEN Xue, XU Jianliang, LI Jing, XIAO Jianfeng, ZHONG Sicun. An Analysis of Main Controlling Factors of Production for Horizontal Shale Gas Well in Weiyuan Block[J]. 西南石油大学学报(自然科学版), 2020, 42(5): 63-74.

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