摘要：Radial drilling-fracturing, the integration of radial drilling and hydraulic fracturing, is an innovative approach to develop low permeability, thin target layer and naturally fractured reservoirs, etc. Investigating fracture initiation process is essential for the successful design and operation of radial drilling-fracturing. We developed an analytical model for determining the fracture initiation pressure (FIP), location of rock failure zones, and initial fracture direction from radial lateral borehole. Then, we analyze effects of in-situ stress regime, lateral orientation and pre-existing weakness plane. Results show that in-situ stress regime, lateral orientation and weakness plane greatly influence FIP, location of rock failure zones, and initial fracture direction. For a given combination of in-situ stress regime and lateral orientation, when fracture initiates longitudinally, FIP enlarges moderately with lateral orientation increasing; rock failure zones consist of two symmetric wings at the base of radial borehole on its top and bottom sides. When fracture initiates horizontally, FIP declines moderately with lateral orientation increasing; rock failure zones consist of two symmetric wings on the remote region of radial borehole on its two lateral sides. Fracture will firstly initiate from the weakness plane, if its tensile or shear failure pressure is less than that FIP from rock matrix.
© 2017 ARMA, American Rock Mechanics Association.

卷、期、页：v 2,p960-969

发表日期：2017-01-01

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：51st US Rock Mechanics / Geomechanics Symposium 2017

通讯作者：刘庆岭,李小江,张振欣,付宣

第一作者：田守嶒,李根生,沈忠厚,盛茂

论文类型：会议论文

论文概要：刘庆岭,田守嶒,李根生,沈忠厚,盛茂,李小江,张振欣,付宣，Hydraulic fracture initiation from radial lateral borehole，51st US Rock Mechanics / Geomechanics Symposium 2017，2017，v 2,p960-969

论文题目：Hydraulic fracture initiation from radial lateral borehole