王志荣, 胡凯, 陈玲霞,等.水平井分段压裂射孔间距对煤储层压裂缝延伸的影响[J].河南理工大学学报（自然科学版）,2023,42(1):9-14.

WANG Z R, HU K, CHEN L X,,et al.Effect of staged fracturing perforation spacing of horizontal well on fracture estension of coal reservoir[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(1):9-14.

水平井分段压裂射孔间距对煤储层压裂缝延伸的影响

王志荣, 胡凯, 陈玲霞, 宋沛

郑州大学 水利科学与工程学院，河南 郑州 450001

摘要:水平井分段压裂射孔间距对煤储层渗透性能影响显著，为了探讨不同射孔间距下煤储层压裂缝延伸规律，以鄂尔多斯大宁-吉县矿区为例，采用扩展有限元法模拟射孔间距对压裂缝起裂压力、几何特征和延伸形态的影响。结果表明：当射孔间距较小时，裂缝起裂压力较高，高度与宽度较小，且延伸形态较为复杂，裂缝偏向最小水平主应力方向延伸；随着射孔间距增大，裂缝起裂压力降低，高度与宽度增加，裂缝延伸逐渐回归到最大水平主应力方向；射孔间距达到105 m时，裂缝起裂压力与几何形态基本不再发生变化，所有裂缝不再偏转，压裂效果最佳。现场验证表明，模拟结果与实测数据吻合度较高，各项参数误差仅2%~5%，从而证明所建数值模型的正确性。研究结果可为水平井分段压裂施工设计提供理论依据。

关键词:水平井;分段压裂;扩展有限元;射孔间距;裂缝延伸

doi:10.16186/j.cnki.1673-9787.2020010015

基金项目:国家自然科学基金资助项目（41272339）

收稿日期:2020/01/05

修回日期:2020/07/09

出版日期:2023/01/25

Effect of staged fracturing perforation spacing of horizontal well on fracture estension of coal reservoir

WANG Zhirong, HU Kai, CHEN Lingxia, SONG Pei

School of Water Conservancy Engineering，Zhengzhou University，Zhengzhou 450001，Henan，China

Abstract:The perforation spacing of horizontal well staged fracturing has a significant effect on the permeability of coal reservoir.In order to explore the law of fracture extension of coal reservoir under different perforation spacing，taking Daning Jixian block of Ordos as an example，the extended finite element method was used to simulate and study the effect of perforation spacing on the initiation pressure，geometric characteristics and extension morphology of fracture.The results showed that when the perforation spacing was small，the fracture initiation pressure was high，the height and width were small，and the extension form was complex.The fracture extended in the direction of the minimum horizontal principal stress； With the increase of perforation spacing，the fracture initiation pressure decreased，the height and width increased，and the fracture extension gradually returned to the direction of the maximum horizontal principal stress； When the perforation spacing reached 105 m，the fracture initiation pressure and geometric shape basically did not change，all fractures did not deflect，and the fracturing effect reached the best.Field verification showed that the simulation results and the measured data had a high coincidence，the relative error was only 2%~5%，which proved the applicability of the numerical model.The research results could provide theoretical basis for the staged fracturing construction design of horizontal wells.

Key words:horizontal well;staged fracturing;extended finite element;perforation spacing;fracture extension

 002_2020010015_王志荣_H.pdf