摘要：Conventional fracture closure models typically assume homogeneous formation. This assumption renders complex fracture closure pressure analysis during shut-in insufficient at present. In this paper, we use a cohesive zone method (CZM)-based finite element model to obtain the fracture closure pressure and minimum horizontal principal stress of the major fracture and the branch fracture based on pressure fall-off analysis. Key factors including leak-off rate, injection time, and stress anisotropy are discussed in detail. A quantitative relationship between fracture closure pressure and these factors is plotted to reduce or eliminate the errors caused by conventional fracture injection diagnostic models. The results show that leak-off rate, injection time, and stress anisotropy have a significant effect on the fracture closure process. Fracture closure in naturally fractured formations is a slow process, and the early closure pressure represents the closure of the branch fracture, which is much higher than the minimum horizontal stress. This investigation provides new insight into how to estimate the in-situ stress in naturally fractured reservoirs.

关键字：Fracture closure; complex fracture network; shut-in decline; hydraulic fracturing; stress measurement

ISSN号：0144-5987

卷、期、页：卷: 40期: 4页: 1252-1267

发表日期：2022-07-01

影响因子：2.138900

期刊分区（SCI为中科院分区）：四区

收录情况：SCIE（科学引文索引网络版）,EI（工程索引）

发表期刊名称：ENERGY EXPLORATION & EXPLOITATION

参与作者：汪道兵,Wang, Yang,Sun, Dongliang,Yu, Bo

第一作者：葛洪魁,王小琼

论文类型：期刊论文

论文概要：汪道兵,葛洪魁,王小琼,Wang, Yang,Sun, Dongliang,Yu, Bo，Complex Fracture Closure Pressure Analysis During Shut-in: A Numerical Study，ENERGY EXPLORATION & EXPLOITATION，2022，卷: 40期: 4页: 1252-1267

论文题目：Complex Fracture Closure Pressure Analysis During Shut-in: A Numerical Study