摘要：Multi-branch radial boreholes can be drilled and combined with hydraulic fracturing to efficiently stimulate tight gas reservoirs. This paper experimentally investigates how horizontal stress difference affects fracture geometry and breakdown pressure in multi-branch radial borehole fracturing by a true triaxial fracturing device. Six artificial rocks (395 mm ×395 mm ×395 mm) were cast for the experiments, which are divided into two groups by the azimuth of the radial borehole. The results show that fracture geometries are controlled by the rectification of a single radial borehole, the extrusion between the adjacent radial borehole row, and the deflection of the maximum horizontal stress. Fracture propagation is affected by the dynamic variation of the three effects. Decreasing the stress difference is favorable for fracture propagation along the radial borehole axis, while it lifts the breakdown pressure. Decreasing the azimuth lifts fracture extension distance parallel to the radial borehole axis and reduces the breakdown pressure. This research sheds light on the feasibility of radial borehole fracturing for reservoirs under various stress differences. ? 2023 57th US Rock Mechanics/Geomechanics Symposium. All Rights Reserved.

ISSN号：无

卷、期、页：57th US Rock Mechanics/Geomechanics Symposium

发表日期：2023-06-25

期刊分区（SCI为中科院分区）：无

收录情况：EI（工程索引）

发表期刊名称：57th US Rock Mechanics/Geomechanics Symposium

参与作者：郭肇权,廖璐璐

通讯作者：雍煜宁

第一作者：田守嶒,王天宇,盛茂

论文类型：会议论文

论文概要：雍煜宁,郭肇权,田守嶒,王天宇,盛茂,廖璐璐，Fracture Geometries and Breakdown Pressures of Multi-Branch Radial Borehole Fracturing Influenced by Horizontal Stress Difference，57th US Rock Mechanics/Geomechanics Symposium，2023，57th US Rock Mechanics/Geomechanics Symposium

论文题目：Fracture Geometries and Breakdown Pressures of Multi-Branch Radial Borehole Fracturing Influenced by Horizontal Stress Difference